diff --git a/src/cmd/9l/obj.c b/src/cmd/9l/obj.c
index 1ab18f491a..badb72a1ac 100644
--- a/src/cmd/9l/obj.c
+++ b/src/cmd/9l/obj.c
@@ -88,7 +88,7 @@ archinit(void)
 		if(INITDAT == -1)
 			INITDAT = 0;
 		if(INITRND == -1)
-			INITRND = 4096;
+			INITRND = 0x10000;
 		break;
 	case Hnacl:
 		elfinit();
diff --git a/src/pkg/math/big/arith_power64x.s b/src/pkg/math/big/arith_power64x.s
new file mode 100644
index 0000000000..502d40cb64
--- /dev/null
+++ b/src/pkg/math/big/arith_power64x.s
@@ -0,0 +1,46 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build power64 power64le
+
+#include "../../../cmd/ld/textflag.h"
+
+// This file provides fast assembly versions for the elementary
+// arithmetic operations on vectors implemented in arith.go.
+
+TEXT ·mulWW(SB),NOSPLIT,$0
+	BR ·mulWW_g(SB)
+
+TEXT ·divWW(SB),NOSPLIT,$0
+	BR ·divWW_g(SB)
+
+TEXT ·addVV(SB),NOSPLIT,$0
+	BR ·addVV_g(SB)
+
+TEXT ·subVV(SB),NOSPLIT,$0
+	BR ·subVV_g(SB)
+
+TEXT ·addVW(SB),NOSPLIT,$0
+	BR ·addVW_g(SB)
+
+TEXT ·subVW(SB),NOSPLIT,$0
+	BR ·subVW_g(SB)
+
+TEXT ·shlVU(SB),NOSPLIT,$0
+	BR ·shlVU_g(SB)
+
+TEXT ·shrVU(SB),NOSPLIT,$0
+	BR ·shrVU_g(SB)
+
+TEXT ·mulAddVWW(SB),NOSPLIT,$0
+	BR ·mulAddVWW_g(SB)
+
+TEXT ·addMulVVW(SB),NOSPLIT,$0
+	BR ·addMulVVW_g(SB)
+
+TEXT ·divWVW(SB),NOSPLIT,$0
+	BR ·divWVW_g(SB)
+
+TEXT ·bitLen(SB),NOSPLIT,$0
+	BR ·bitLen_g(SB)
diff --git a/src/pkg/runtime/arch_power64.h b/src/pkg/runtime/arch_power64.h
index 3d5b4943c7..1dcbbc226c 100644
--- a/src/pkg/runtime/arch_power64.h
+++ b/src/pkg/runtime/arch_power64.h
@@ -7,7 +7,7 @@ enum {
 	BigEndian = 1,
 	CacheLineSize = 64,
 	RuntimeGogoBytes = 84,
-	PhysPageSize = 4096,
+	PhysPageSize = 65536,
 	PCQuantum = 4,
 	Int64Align = 8
 };
diff --git a/src/pkg/runtime/asm_power64x.s b/src/pkg/runtime/asm_power64x.s
index 2fbaf5a53e..59c7a9eb5a 100644
--- a/src/pkg/runtime/asm_power64x.s
+++ b/src/pkg/runtime/asm_power64x.s
@@ -782,8 +782,8 @@ TEXT bytes·IndexByte(SB),NOSPLIT,$0-40
 	MOVD	s+0(FP), R3
 	MOVD	s_len+8(FP), R4
 	MOVBZ	c+24(FP), R5	// byte to find
+	MOVD	R3, R6		// store base for later
 	SUB	$1, R3
-	MOVD	R3, R6		// store base-1 for later
 	ADD	R3, R4		// end-1
 
 _index_loop:
@@ -798,16 +798,16 @@ _index_loop:
 	RETURN
 
 _index_notfound:
-	MOVW	$-1, R3
-	MOVW	R3, ret+32(FP)
+	MOVD	$-1, R3
+	MOVD	R3, ret+32(FP)
 	RETURN
 
 TEXT strings·IndexByte(SB),NOSPLIT,$0
 	MOVD	p+0(FP), R3
 	MOVD	b_len+8(FP), R4
 	MOVBZ	c+16(FP), R5	// byte to find
+	MOVD	R3, R6		// store base for later
 	SUB	$1, R3
-	MOVD	R3, R6		// store base-1 for later
 	ADD	R3, R4		// end-1
 
 _index2_loop:
@@ -822,8 +822,8 @@ _index2_loop:
 	RETURN
 
 _index2_notfound:
-	MOVW	$-1, R3
-	MOVW	R3, ret+24(FP)
+	MOVD	$-1, R3
+	MOVD	R3, ret+24(FP)
 	RETURN
 
 
diff --git a/src/pkg/runtime/mem_linux.c b/src/pkg/runtime/mem_linux.c
index 635594c365..30594c5282 100644
--- a/src/pkg/runtime/mem_linux.c
+++ b/src/pkg/runtime/mem_linux.c
@@ -10,7 +10,7 @@
 
 enum
 {
-	_PAGE_SIZE = 4096,
+	_PAGE_SIZE = PhysPageSize,
 	EACCES = 13,
 };
 
@@ -35,8 +35,9 @@ addrspace_free(void *v, uintptr n)
 		errval = runtime·mincore((int8*)v + off, chunk, vec);
 		// ENOMEM means unmapped, which is what we want.
 		// Anything else we assume means the pages are mapped.
-		if (errval != -ENOMEM)
+		if (errval != -ENOMEM && errval != ENOMEM) {
 			return 0;
+		}
 	}
 	return 1;
 }
@@ -47,12 +48,15 @@ mmap_fixed(byte *v, uintptr n, int32 prot, int32 flags, int32 fd, uint32 offset)
 	void *p;
 
 	p = runtime·mmap(v, n, prot, flags, fd, offset);
-	if(p != v && addrspace_free(v, n)) {
+	if(p != v) {
+		if(p > (void*)4096) {
+			runtime·munmap(p, n);
+			p = nil;
+		}
 		// On some systems, mmap ignores v without
 		// MAP_FIXED, so retry if the address space is free.
-		if(p > (void*)4096)
-			runtime·munmap(p, n);
-		p = runtime·mmap(v, n, prot, flags|MAP_FIXED, fd, offset);
+		if(addrspace_free(v, n))
+			p = runtime·mmap(v, n, prot, flags|MAP_FIXED, fd, offset);
 	}
 	return p;
 }
diff --git a/src/pkg/runtime/sys_linux_power64x.s b/src/pkg/runtime/sys_linux_power64x.s
index c0c41efa95..f5149eaeaf 100644
--- a/src/pkg/runtime/sys_linux_power64x.s
+++ b/src/pkg/runtime/sys_linux_power64x.s
@@ -223,7 +223,6 @@ TEXT runtime·mmap(SB),NOSPLIT,$-8
 
 	SYSCALL	$SYS_mmap
 	BVC	2(PC)
-	NEG	R3, R3
 	RETURN
 
 TEXT runtime·munmap(SB),NOSPLIT,$-8
diff --git a/src/pkg/syscall/asm_linux_power64x.s b/src/pkg/syscall/asm_linux_power64x.s
index 1dd23ef305..c9b0fe320c 100644
--- a/src/pkg/syscall/asm_linux_power64x.s
+++ b/src/pkg/syscall/asm_linux_power64x.s
@@ -24,7 +24,6 @@ TEXT	·Syscall(SB),NOSPLIT,$0-56
 	MOVD	trap+0(FP), R9	// syscall entry
 	SYSCALL R9
 	BVC	ok
-	NEG	R3, R3
 	MOVD	$-1, R4
 	MOVD	R4, r1+32(FP)	// r1
 	MOVD	R0, r2+40(FP)	// r2
@@ -49,7 +48,6 @@ TEXT ·Syscall6(SB),NOSPLIT,$0-80
 	MOVD	trap+0(FP), R9	// syscall entry
 	SYSCALL R9
 	BVC	ok6
-	NEG	R3, R3
 	MOVD	$-1, R4
 	MOVD	R4, r1+56(FP)	// r1
 	MOVD	R0, r2+64(FP)	// r2
@@ -73,7 +71,6 @@ TEXT ·RawSyscall(SB),NOSPLIT,$0-56
 	MOVD	trap+0(FP), R9	// syscall entry
 	SYSCALL R9
 	BVC	ok1
-	NEG	R3, R3
 	MOVD	$-1, R4
 	MOVD	R4, r1+32(FP)	// r1
 	MOVD	R0, r2+40(FP)	// r2
@@ -95,7 +92,6 @@ TEXT ·RawSyscall6(SB),NOSPLIT,$0-80
 	MOVD	trap+0(FP), R9	// syscall entry
 	SYSCALL R9
 	BVC	ok2
-	NEG	R3, R3
 	MOVD	$-1, R4
 	MOVD	R4, r1+56(FP)	// r1
 	MOVD	R0, r2+64(FP)	// r2